Long-Lived Assets - Summary of Carrying Value of Software Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 166,289	$ 157,963
Accumulated Amortization	(139,836)	(125,437)
Net Amount	26,453	32,526
Acquired software
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	75,602	75,370
Accumulated Amortization	(70,242)	(68,157)
Net Amount	5,360	7,213
Internal use software
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	90,687	82,593
Accumulated Amortization	(69,594)	(57,280)
Net Amount	$ 21,093	$ 25,313